No. There is no scrambling. You're cable or settings are messed up. See:
viewtopic.php?f=52&t=4974#p37816
The telnetd VDLinux prompt happily echoes whatever I type as I type it (letters, numbers, special chars)
Do you have local echo enabled?
...but doesn't do anything more than give me a newline when I hit enter.
Same thing happened to me when I ran:
Code: Select all
sh -c 'exec sh -i </dev/tty >/dev/tty 2>&1' &
It gave me a "VDLinux>" prompt, but doing funny and worrysome shit...
Code: Select all
-----------------------------------------------------------------------------------------------------
VDLinux#> ##### call default signal (17) handler
[2]+ Stopped (tty input) /mtd_exe/rc.local
[1]- Done(1) ${MICOM_BASE}/micom rollback
Saving emergency log dump
******************************************************
Application running is failed
SW image is stopped
******************************************************
VDLinux#> VDLinux#> VDLinux#> ##### call default signal (1) handler
process '/bin/cttyhack -/bin/sh' (pid 36) exited. Scheduling for restart.
starting pid 1603, tty '': '/bin/cttyhack -/bin/sh'
/etc/profile start
##### send signal from USER, SIG : 1, busybox(1201)->busybox(1201) sys_tgkill
insmod: can't insert '/lib/modules/rfs_glue.ko': File exists
insmod: can't insert '/lib/modules/rfs_fat.ko': File exists
1st partition
1st Partition is selected
mount mtd_exe
mount: mounting none on /sys/fs/cgroup failed: Device or resource busy
mkdir: can't create directory '/sys/fs/cgroup/fg_group': File exists
mount: mounting /dev/mmcblk0p13 on /mtd_exe/ failed: Device or resource busy
mount mtd_exe fail
mkdir: can't create directory '/sys/fs/cgroup/bg_group': File exists
mount mtd_rwarea
mount: mounting /dev/mmcblk0p12 on /mtd_rwarea failed: Device or resource busy
Cgroup Fail
Success to format
mount: mounting /dev/mmcblk0p12 on /mtd_rwarea failed: Device or resource busy
mount mtd_rwarea fail
[1]+ Done /etc/cgroup_init
mount mtd_drmregion_a
mount: mounting /dev/mmcblk0p10 on /mtd_drmregion_a failed: Device or resource b
usy
Success to format
mount mtd_drmregion_b
mount: mounting /dev/mmcblk0p11 on /mtd_drmregion_b failed: Device or resource b
usy
Success to format
Partition.txt doesn't exist
mount mtd_appext
mount: mounting /dev/mmcblk0p15 on /mtd_appext/ failed: Device or resource busy
mount mtd_appext fail
mount mtd_rocommon
mount: mounting /dev/mmcblk0p17 on /mtd_rocommon failed: Device or resource busy
mount mtd_rocommon fail
Saving emergency log dump
[1]+ Done(1) ${MICOM_BASE}/micom rollback
******************************************************
Application running is failed
SW image is stopped
******************************************************
VDLinux#>
As you can see it triggered "micom rollback" and was attempting to format the partitions!
After that my TV no longer retains channel memory!! I also had a huge log (that I missed saving) giving lots of errors.
I believe the mistake was in the "2>&1" part of that line, which re-directs stdin/stdout/stderr to somewhere else...and if current console is used by micom, that is very bad! I also accidentally sent some crap to /dev/ttyS1 (Micom) with some other blind-folded memory dump command!
Never use /dev/ttyS1 for anything!
Stuff like '~~bye' doesn't appear to do anything. running netcat piped to a shell on a random port is much more useful (can run arbitrary shell commands remotely and get at least stdout back easily). Nice thing about the shell escape trick with 'Copy' is that I imagine it should work on most of the older TVs and definitely works on the latest hw/fw if my TV is any indication.
I have no idea what you're talking about, do you have an example? It is always recommended to show your commands when discussing results...since everyone will eventually ask for them anyways.
EDIT (2012-12-19):
I noticed (too late) another thing. Be very careful when trying to start interactive shells, as they might wanna load
/etc/profile !
Why, because this profile contains instructions to re-format, or switch FW, which can easily fail in the wrong circumstances.
Code: Select all
# /etc/profile
echo "/etc/profile start"
export PATH="/usr/sbin:/usr/bin:/bin:/sbin:/etc/Scripts:/util"
export LD_LIBRARY_PATH="/lib"
export MODULES_DIR=/lib/modules
export MICOM_BASE=/sbin
export MALLOC_CHECK_=1
############## Flash Driver ###########
insmod $MODULES_DIR/rfs_glue.ko
insmod $MODULES_DIR/rfs_fat.ko
echo "4096 87380 1425408" > /proc/sys/net/ipv4/tcp_rmem
############## Partition Information ##############
export MTD_ONBOOT=/dev/mmcblk0p0
export MTD_UBOOT=/dev/mmcblk0p1
export MTD_KERNEL_0=/dev/mmcblk0p2
export MTD_ROOTFS_0=/dev/mmcblk0p3
export EX_PARTITION=/dev/mmcblk0p4
export MTD_KERNEL_1=/dev/mmcblk0p5
export MTD_ROOTFS_1=/dev/mmcblk0p6
export SECUREMAC0=/dev/mmcblk0p7
export SECUREMAC1=/dev/mmcblk0p8
export SECUREMAC2=/dev/mmcblk0p9
export MTD_DRMREGION_A=/dev/mmcblk0p10
export MTD_DRMREGION_B=/dev/mmcblk0p11
export MTD_RWAREA=/dev/mmcblk0p12
export MTD_EXE_0=/dev/mmcblk0p13
export MTD_EXE_1=/dev/mmcblk0p14
export MTD_APP_0=/dev/mmcblk0p15
export MTD_APP_1=/dev/mmcblk0p16
export MTD_ROCOMMON=/dev/mmcblk0p17
export MTD_EMANUAL=/dev/mmcblk0p18
export MTD_CONTENTS=/dev/mmcblk0p19
export MTD_SWU=/dev/mmcblk0p20
export MTD_RWCOMMON=/dev/mmcblk0p21
############## SWU Parameter Init ##############
export PARTITION_FLAG00=/mtd_rwarea/PartitionSwitch_0_0
export PARTITION_FLAG10=/mtd_rwarea/PartitionSwitch_1_0
export PARTITION_VERSION_1ST=/mtd_swu/Version.0
export PARTITION_VERSION_2ND=/mtd_swu/Version.1
export PARTITION_CHECK_1ST=/mtd_rwarea/empty.0
export PARTITION_CHECK_2ND=/mtd_rwarea/empty.1
export EXE_OR_RWREA_MOUNT_CHECK=/mtd_rwarea/exe_or_rwarea_mount_check
export CHANGE_PARTITION_FLAG=/mtd_rwarea/change_partition_flag
export UPGRADE_FLAG=/mtd_rwarea/UPGRADE_FLAG
############## Parameter Init ##############
SUCCESS_MOUNT="true"
UseSecondPartition="false"
CurrentFlag=$PARTITION_FLAG00
ulimit -c unlimited
#### Execution Cgroup Init Script ####
/etc/cgroup_init &
######################################
############## Boot partition select ##############
PART_FLAG=$(cat /proc/cmdline | cut -d'/' -f3 | cut -d' ' -f1)
if [ "$PART_FLAG" = "mmcblk0p3" ]
then
echo "1st partition"
UseSecondPartition="false"
CurrentFlag=$PARTITION_FLAG00
else
echo "2nd partition"
UseSecondPartition="true"
CurrentFlag=$PARTITION_FLAG10
fi
if [ "$UseSecondPartition" = "true" ]
then
echo "2nd Partition is selected"
EXE_MOUNT=$MTD_EXE_1
APP_MOUNT=$MTD_APP_1
EXE_MOUNT_SUB=$MTD_EXE_0
APP_MOUNT_SUB=$MTD_APP_0
else
echo "1st Partition is selected"
EXE_MOUNT=$MTD_EXE_0
APP_MOUNT=$MTD_APP_0
EXE_MOUNT_SUB=$MTD_EXE_1
APP_MOUNT_SUB=$MTD_APP_1
fi
echo "mount mtd_exe"
mount -t squashfs $EXE_MOUNT /mtd_exe/
if [ $? != 0 ]
then
echo "mount mtd_exe fail"
SUCCESS_MOUNT="false"
fi
if [ -e /mtd_exe/TunerInit ]
then
/mtd_exe/TunerInit&
fi
echo "mount mtd_rwarea"
mount -t rfs $MTD_RWAREA /mtd_rwarea
if [ $? != 0 ]
then
umount /mtd_rwarea 2> /dev/null
fat.format -F 32 -s 1 -S 1024 $MTD_RWAREA
mount -t rfs $MTD_RWAREA /mtd_rwarea
if [ $? != 0 ]
then
echo "mount mtd_rwarea fail"
SUCCESS_MOUNT="false"
fi
fi
echo "mount mtd_drmregion_a"
mount -t rfs $MTD_DRMREGION_A /mtd_drmregion_a
if [ $? != 0 ]
then
umount /mtd_drmregion_a 2> /dev/null
fat.format -F 16 -s 1 -S 512 $MTD_DRMREGION_A
mount -t rfs $MTD_DRMREGION_A /mtd_drmregion_a
if [ $? != 0 ]
then
echo "mount mtd_drmregion_a fail"
SUCCESS_MOUNT="false"
fi
fi
echo "mount mtd_drmregion_b"
mount -t rfs $MTD_DRMREGION_B /mtd_drmregion_b
if [ $? != 0 ]
then
umount /mtd_drmregion_b 2> /dev/null
fat.format -F 16 -s 1 -S 512 $MTD_DRMREGION_B
mount -t rfs $MTD_DRMREGION_B /mtd_drmregion_b
if [ $? != 0 ]
then
echo "mount mtd_drmregion_b fail"
SUCCESS_MOUNT="false"
fi
fi
rm -f /mtd_rwarea/PartitionSwitch*
if [ "$PART_FLAG" = "mmcblk0p3" ]
then
touch $PARTITION_FLAG00
else
touch $PARTITION_FLAG10
fi
if [ -e /mtd_rwarea/change_partition_flag ]
then
usb_start.sh
if [ "$SUCCESS_MOUNT" = "false" ]
then
echo "EXE or RWAREA mount error"
touch $EXE_OR_RWREA_MOUNT_CHECK
rm /mtd_rwarea/change_partition_flag
#micom reboot
sleep 3
fi
echo "Partition.txt is exist"
#micom ledon
/etc/Scripts/partition_check.sh
rm /mtd_rwarea/change_partition_flag
/etc/Scripts/update_change_partition_flag.sh
sleep 3
else
echo "Partition.txt doesn't exist"
fi
echo "mount mtd_appext"
mount -t squashfs $APP_MOUNT /mtd_appext/
if [ $? != 0 ]
then
echo "mount mtd_appext fail"
SUCCESS_MOUNT="false"
fi
echo "mount mtd_rocommon"
mount -t squashfs $MTD_ROCOMMON /mtd_rocommon
if [ $? != 0 ]
then
echo "mount mtd_rocommon fail"
SUCCESS_MOUNT="false"
fi
$MICOM_BASE/micom rollback &
if [ "$SUCCESS_MOUNT" = "true" ]
then
echo "== Start exeDSP =="
/mtd_exe/rc.local
fi
# save emergency log dump
echo "Saving emergency log dump"
/util/save_error_log
sync
if [ -e $UPGRADE_FLAG ]
then
echo "******************************************************"
echo "Application running is failed"
echo "SW image is stopped"
echo "******************************************************"
else
echo "Application running is failed..try to do emergency state handling"
echo "wait 5 seconds"
x=0
while [ $x -lt 5 ]
do
x=$(($x + 1))
sleep 1
echo $x
done
if [ "$UseSecondPartition" = "true" ]
then
if [ -e $PARTITION_CHECK_1ST ]
then
echo "no sub SW image...going shutdown : DEV"
##$MICOM_BASE/micom shutdown
else
echo "current partition 2nd is corrupted. roll back to sub partition 1st"
rm -f $PARTITION_VERSION_2ND
touch $PARTITION_CHECK_2ND
sync
$MICOM_BASE/micom toggle 0
touch $USB_UPDATE_FLAG
sync
echo "Reboot system"
$MICOM_BASE/micom reboot
fi
else
if [ -e $PARTITION_CHECK_2ND ]
then
echo "no sub SW image...going shutdown : DEV"
##$MICOM_BASE/micom shutdown
else
echo "current partition 1st is corrupted. roll back to sub partition 2nd"
rm -f $PARTITION_VERSION_1ST
touch $PARTITION_CHECK_1ST
sync
$MICOM_BASE/micom toggle 1
touch $USB_UPDATE_FLAG
sync
echo "Reboot system"
$MICOM_BASE/micom reboot
fi
fi
fi
